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A8591 डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - 2A Buck Regulator Family - Allegro

भाग संख्या A8591
समारोह 2A Buck Regulator Family
मैन्युफैक्चरर्स Allegro 
लोगो Allegro लोगो 
पूर्व दर्शन
1 Page
		
<?=A8591?> डेटा पत्रक पीडीएफ

A8591 pdf
A8591
Wide Input Voltage, 2 A Buck
Regulator Family with Low-IQ Mode
FEATURES AND BENEFITS (CONTINUED)
• External compensation for maximum flexibility
• Stable with ceramic or electrolytic output capacitors
• Internally fixed soft-start time of 5 ms
• Pulse-by-pulse current limit, hiccup mode short-circuit, and
thermal protections
• Pin open/short and component fault tolerant
• –40°C to 150°C operating junction temperature range
• Thermally enhanced DFN-10 surface-mount package
DESCRIPTION (CONTINUED)
Extensive protection features of the A8591 include pulse-by-pulse
current limit, hiccup mode short-circuit protection, open/short
asynchronous diode protection, BOOTopen/short voltage protection,
VIN undervoltage lockout, and thermal shutdown.
The A8591 is supplied in a 10-pin wettable flank DFN package
(suffix EJ) with exposed power pad. It is lead (Pb) free, with 100%
matte-tin leadframe plating.
Selection Guide
Part Number
Packing*
Output Voltage Option
A8591KEJTR-J
1500 pieces per 7-in. reel
5 V compatible
A8591KEJTR-J-1
1500 pieces per 7-in. reel
3.3 V compatible
*Contact Allegro™ for additional packing options
Table of Contents
Specifications
3
Absolute Maximum Ratings
3
Thermal Characteristics
3
Functional Block Diagram
4
Pinout Diagram and Terminal List Table
5
Electrical Characteristics
6
Characteristic Performance
10
Dropout Operation – Typical and
Worst-Cast Operation
12
Functional Description
13
Overview
13
Reference Voltage
13
PWM Switching Frequency
13
EN/SLEEP Input
13
PWM Synchronization
14
Transconductance Error Amplifier
14
Slope Compensation
14
Current-Sense Amplifier
14
Power MOSFETs
14
BOOT Regulator
14
Pulse-Width Modulation (PWM) Mode
15
Low-IQ Pulse-Frequency Modulation (PFM) Mode 15
Soft-Start (Startup) and Inrush Current Control 16
Pre-Biased Startup
17
Active-Low Power-On Reset (NPOR) Output
17
Protection Features
17
Undervoltage Lockout (UVLO)
17
Pulse-by-Pulse Overcurrent Protection (OCP) 17
Overcurrent Protection (OCP) and Hiccup
Mode
18
BOOT Capacitor Protection
18
Asynchronous Diode Protection
18
Overvoltage Protection (OVP)
19
Pin-to-Ground and Pin-to-Pin Short Protections 19
Thermal Shutdown (TSD)
19
Design and Component Selection
21
PWM Switching Frequency (RFSET)
Output Inductor (LO )
Output Capacitors
21
21
22
Low-IQ PFM Output Voltage Ripple Calculation 23
Input Capacitors
24
Asynchronous Diode (D1)
25
Bootstrap Capacitor
25
Compensation Components (RZ, CZ , and CP)
A Generalized Tuning Procedure
25
27
Power Dissipation and Thermal Calculations 29
PCB Component Placement and Routing 30
Package Outline Drawing
31
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2

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